Import upstream version 1.27

[debian/tar] / m4 / mknod.m4

diff --git a/m4/mknod.m4 b/m4/mknod.m4
index d9f68f4c28b8a2bae92b47211bb0bd5c6c048e5d..478ee55915ce07ce308895b7984a4cd44e5ebb5e 100644 (file)
--- a/m4/mknod.m4
+++ b/m4/mknod.m4
@@ -1,7 +1,7 @@
-# serial 3
+# serial 5
 # See if we need to provide mknod replacement.
 
-dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -11,12 +11,12 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_MKNOD],
 [
   AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_REQUIRE([gl_FUNC_MKFIFO])
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   AC_CHECK_FUNCS_ONCE([mknod])
   if test $ac_cv_func_mknod = no; then
     HAVE_MKNOD=0
-    AC_LIBOBJ([mknod])
   else
     dnl Detect BSD bug, where mknod requires root privileges to create fifo.
     AC_CACHE_CHECK([whether mknod can create fifo without root privileges],
@@ -25,9 +25,16 @@ AC_DEFUN([gl_FUNC_MKNOD],
          [AC_LANG_PROGRAM(
            [[#include <sys/stat.h>
              #include <unistd.h>
+
+             /* Copied from root-uid.h.  FIXME: Just use root-uid.h.  */
+             #ifdef __TANDEM
+             # define ROOT_UID 65535
+             #else
+             # define ROOT_UID 0
+             #endif
 ]], [[/* Indeterminate for super-user, assume no.  Why are you running
          configure as root, anyway?  */
-      if (!geteuid ()) return 99;
+      if (geteuid () == ROOT_UID) return 99;
       if (mknod ("conftest.fifo", S_IFIFO | 0600, 0)) return 2;]])],
          [gl_cv_func_mknod_works=yes],
          [if test $? = 99 && test x"$FORCE_UNSAFE_CONFIGURE" = x; then
@@ -35,16 +42,25 @@ AC_DEFUN([gl_FUNC_MKNOD],
 [(set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)])
           fi
           gl_cv_func_mknod_works=no],
-         [gl_cv_func_mknod_works="guessing no"])
+         [case "$host_os" in
+                    # Guess yes on glibc systems.
+            *-gnu*) gl_cv_func_mknod_works="guessing yes" ;;
+                    # If we don't know, assume the worst.
+            *)      gl_cv_func_mknod_works="guessing no" ;;
+          esac
+         ])
        rm -f conftest.fifo])
-    if test "$gl_cv_func_mknod_works" != yes; then
-      AC_DEFINE([MKNOD_FIFO_BUG], [1], [Define to 1 if mknod cannot create
-        a fifo without super-user privileges])
-    fi
+    case "$gl_cv_func_mknod_works" in
+      *yes) ;;
+      *)
+        REPLACE_MKNOD=1
+        AC_DEFINE([MKNOD_FIFO_BUG], [1], [Define to 1 if mknod cannot create
+          a fifo without super-user privileges])
+        ;;
+    esac
     dnl Systems that mishandle trailing slash on mkfifo also goof on mknod.
-    if test $REPLACE_MKFIFO = 1 || test "$gl_cv_func_mknod_works" != yes; then
+    if test $REPLACE_MKFIFO = 1; then
       REPLACE_MKNOD=1
-      AC_LIBOBJ([mknod])
     fi
   fi
 ])